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The basis for a command line tool. To invoke this as a command line tool,
call the run() method on the class. Arguments will be parsed from the
command line. To invoke this in another context, such as from inside
another command, pass keyword arguments to __init__() with names that match
those stored by the argument parser and then call main() to retrieve a
result.
The general workflow of a command involves two methods: main(), which
inspects the arguments stored in self.args, does something, and returns a
result; and print_result(), which takes the output of main() and prints it
to stdout. By default, both of these methods do nothing. It is up to you
to implement them to do what the tool is designed to do.
Important members of this class include:
- DESCRIPTION: a string that describes the tool, which is re-wrapped and
used as part of the command line help string. If it is
not supplied, the class's doc string, if any, will be
used instead.
- USAGE: a usage message for the command line help string. If this
is None, one will be generated automatically.
- ARGS: a list of Arg and/or MutuallyExclusiveArgGroup objects
are used to generate command line arguments. Inheriting
classes needing to add command line arguments should
contain their own ARGS lists, which are combined with
those of their parent classes.
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